Question: What nominative-accusative dead language has the least number of speakers?
Paraphrase: Which of the nominative-accusative dead language possesses the lowest number of speakers?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q45762 . ?ent wdt:P1098 ?obj . ?ent wdt:P4132 wd:Q178435} ORDER BY ASC(?obj)LIMIT 5 
Answer: Old High German, Old East Slavic, Old Irish, Old Church Slavonic, Polabian